#include "ui.h"
#include "../memory/memory.h"
#include "../util/object_pool.h"
#include "../util/string.h"

#include <stb_ds.h>

typedef struct BzUI {
    struct {
        BzUIKey     key;
        BzUIWidget *value;
    } *widgetMap;
    BzObjectPool *widgets;
    BzUIWidget  **widgetStack;
    BzUIWidget  *root;
} BzUI;

BzUIKey bzUIKeyNull() {
    return 0;
}
BzUIKey bzUIKeyFromString(const char *str) {
    return bzStringDefaultHash(str);
}

BzUI *bzUICreate() {
    BzUI *ui = bzAlloc(sizeof(*ui));

    ui->widgetMap = NULL;
    ui->widgetStack = NULL;

    ui->widgets = bzObjectPoolCreate(&(BzObjectPoolDesc) {
        .objectsPerPage=128,
        .objectSize=sizeof(BzUIWidget),
    });

    ui->root = bzObjectPool(ui->widgets);
    bzMemSet(ui->root, 0, sizeof(*ui->root));
    hmput(ui->widgetMap, bzUIKeyFromString("##root"), ui->root);
    return ui;
}
void bzUIDestroy(BzUI *ui) {
    hmfree(ui->widgetMap);
    ui->widgetMap = NULL;
    arrfree(ui->widgetStack);
    ui->widgetStack = NULL;
    bzObjectPoolDestroy(ui->widgets);
    ui->widgets = NULL;
    bzFree(ui);
}

void bzUIBegin(BzUI *ui, i32 width, i32 height) {
    arrsetlen(ui->widgetStack, 0);
    arrpush(ui->widgetStack, ui->root);

    ui->root->semanticSize[BZ_UI_AXIS_X] = (BzUISize){
        .kind = BZ_UI_SIZE_PIXELS,
        .value = width
    };
    ui->root->semanticSize[BZ_UI_AXIS_Y] = (BzUISize) {
        .kind = BZ_UI_SIZE_PIXELS,
        .value = height
    };

}
void bzUIEnd(BzUI *ui) {

}